Funny, sitting here watching the Military Channel, show called CIA secrets, they were showing how operatives passed messages by way of hiding common objects, some in plain sight, some in secluded areas,, hollowed out tree limbs, small magnetic containers, other containers that blended into the area they were hidden,, in rotten stumps, in fake cans, fake rocks, bottles, etc, remind you of something, maybe some cachers here could teach the CIA a few tricks,, I just found if very funny the way they were explaining it, it was geocaching at its best. Ha...:D